This disclosure provides methods, devices and systems for acknowledgement and retransmission, and more specifically, to methods, devices and systems that enable a secondary wireless channel to provide acknowledgements of data transmitted on a primary wireless channel concurrently with the reception of additional data on the primary wireless channel. In some implementations, a transmitting device may transmit wireless packets including multiple codewords to a receiving device via a first wireless channel. The receiving device may attempt to decode the received codewords based on primary information in the codewords. The receiving device may then transmit to the transmitting device, via a second wireless channel, a codeword acknowledgement that identifies codewords that the receiving device did not successfully decode. The transmitting device may then transmit parity information to the receiving device via the first wireless channel that aids the receiving device in decoding the identified codewords.
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5. The method of claim 4, wherein the generation of the parity information for each of the one or more code blocks includes generating a plurality of instances of parity information for each of the one or more code blocks, wherein the combination of the parity information with the primary information in each of the one or more codewords includes only a first instance of parity information of the plurality of instances of parity information associated with the respective code block, and wherein the transmission of the respective instance of parity information based on the first codeword acknowledgement comprises transmitting a second instance of parity information of the plurality of instances of parity information associated with the code block.
6. The method of claim 5, further comprising, for each of one or more of the code blocks, dividing the respective parity information into a plurality of subsets of parity bits, each of the instances of parity information for the code block consisting of a corresponding one of the subsets of parity bits, wherein the first instance of parity information includes only a first subset of parity bits of the plurality of subsets of parity bits associated with the respective code block, and wherein the second instance of parity information includes only a second subset of parity bits of the plurality of parity bits associated with the code block.
8. The method of claim 1, further comprising, in response to the first codeword acknowledgement, for each codeword indicated by the first codeword acknowledgement as not being successfully decoded, dynamically generating the respective instance of parity information.
9. The method of claim 1, further comprising, for each of one or more of the codewords indicated by the first codeword acknowledgement as not being successfully decoded, refraining from retransmitting the respective primary information with the transmission of the respective instance of parity information.
This invention relates to wireless communication systems, specifically improving data transmission efficiency by optimizing retransmission of encoded data. The problem addressed is the inefficiency in retransmitting both primary information and parity information for codewords that were not successfully decoded, leading to unnecessary resource consumption. The method involves a communication system where data is transmitted using forward error correction (FEC) techniques, such as erasure codes, where primary information and corresponding parity information are sent in separate transmissions. When a receiver fails to decode one or more codewords, it sends an acknowledgement indicating which codewords were not successfully decoded. Instead of retransmitting both the primary information and parity information for these failed codewords, the system refrains from retransmitting the primary information, relying solely on the parity information to recover the missing data. This reduces redundant transmissions and improves spectral efficiency. The method applies to scenarios where parity information is sufficient to reconstruct the primary information, such as in systems using rateless codes or other FEC schemes where parity packets can independently recover lost data. By avoiding unnecessary retransmissions, the system conserves bandwidth and reduces latency, particularly in high-loss or high-latency networks. The approach is applicable to various wireless communication standards, including cellular networks, Wi-Fi, and satellite communications.
17. The method of claim 14, further comprising, for each of one or more of the codewords indicated by the first codeword acknowledgement as not being successfully decoded, receiving a retransmission of the respective primary information with the instance of parity information.
The invention relates to wireless communication systems, specifically to error correction and retransmission mechanisms for improving data reliability. The problem addressed is the inefficient handling of failed codeword decoding in wireless transmissions, leading to unnecessary retransmissions or data loss. The method involves transmitting a set of codewords, each containing primary information and associated parity information for error correction. A receiving device decodes the codewords and generates a first codeword acknowledgement indicating which codewords were successfully decoded. For codewords that failed decoding, the method includes retransmitting the primary information of those specific codewords along with their corresponding parity information. This targeted retransmission reduces redundant data transmission and improves efficiency by avoiding full retransmissions of successfully decoded codewords. The parity information allows the receiver to correct errors in the retransmitted primary information, enhancing reliability. The method may also involve adjusting transmission parameters, such as modulation and coding schemes, based on the decoding results to optimize future transmissions. This approach minimizes latency and resource usage while ensuring data integrity in wireless communication systems.
19. The method of claim 14, further comprising receiving a second PHY layer PDU after the transmission of the first codeword acknowledgement, wherein at least one of the instances of parity information associated with at least one of the codewords indicated by the first codeword acknowledgement as not being successfully decoded is received within the second PDU.
22. The wireless communication device of claim 21, wherein to generate the parity information for each of the one or more code blocks, the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to generate a plurality of instances of parity information for each of the one or more code blocks, wherein the combination of the parity information with the primary information in each of the one or more codewords includes only a first instance of parity information of the plurality of instances of parity information associated with the respective code block, and wherein the transmission of the respective instance of parity information based on the first codeword acknowledgement comprises transmitting a second instance of parity information of the plurality of instances of parity information associated with the code block.
23. The wireless communication device of claim 20, wherein, in response to the first codeword acknowledgement, the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to, for each codeword indicated by the first codeword acknowledgement as not being successfully decoded, dynamically generate the respective instance of parity information.
25. The wireless communication device of claim 24, wherein the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to, for each of one or more of the codewords indicated by the first codeword acknowledgement as not being successfully decoded, receive a retransmission of the respective primary information with the instance of parity information.
26. The wireless communication device of claim 24, wherein the code, when executed by the at least one processor in conjunction with the at least one modem, is further configured to cause the wireless communication device to receive a second PHY layer PDU after the transmission of the first codeword acknowledgement, wherein at least one of the instances of parity information associated with at least one of the codewords indicated by the first codeword acknowledgement as not being successfully decoded is received within the second PDU.
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September 23, 2020
November 22, 2022
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